ABSTRACT
Thirty-nine patients with implant fractures treated by three of the authors have been analyzed as to probable causes. Thirty-five (90%) of the fractures occurred in the posterior region. Thirty (77%) of the prostheses were supported by one or two implants, which were exposed to a combination of cantilever load magnification and bruxism or heavy occlusal forces. It was concluded that prostheses supported by one or two implants and replacing missing posterior teeth are subjected to an increased risk of bending overload. The literature review indicates that the fracture frequency is low in these situations and this study demonstrates that with appropriate treatment planning, such overload situations can essentially be prevented.
Subject(s)
Dental Implants , Dental Stress Analysis , Alveolar Bone Loss/etiology , Bicuspid , Bite Force , Bruxism/complications , Dental Implants/adverse effects , Elasticity , Humans , Molar , Prosthesis Failure , Retrospective Studies , Stress, Mechanical , Tensile StrengthABSTRACT
The marginal and internal adaptation of metal ceramic crowns fabricated by electrical discharge machining and conventional metal ceramic alloys were compared. The crowns were cemented using zinc phosphate cement, embedded in epoxy resin, and sectioned in two planes: diagonal and buccolingual. The crowns were then measured at nine sites. The results showed that there were no statistical differences between the external marginal opening of the titanium and the gold-platinum-palladium crowns. The overall marginal discrepancies for the restorations in this study were 61 microns (+/- 34 microns) for the titanium metal ceramic crowns and 47 microns (+/- 17 microns) for the gold-platinum-palladium metal ceramic crowns.
Subject(s)
Crowns , Dental Marginal Adaptation , Metal Ceramic Alloys , Analysis of Variance , Dental Abutments , Dental Porcelain , Gold Alloys , Humans , Models, Structural , Palladium , Platinum , TitaniumABSTRACT
A brief history of electrical discharge machining (EDM) is given and the process is discussed. A description of the application of EDM for fabricating precision attachment removable partial dentures, fixed-removable implant prostheses, and titanium-ceramic crowns is presented. The advantages and disadvantages of the EDM process for the dental profession are evaluated. Although expensive, the procedure has merit.
Subject(s)
Dental Polishing/methods , Denture Design/instrumentation , Technology, Dental/methods , Crowns , Dental Polishing/instrumentation , Denture Precision Attachment , Denture, Partial, Fixed , Electrodes , ElectrolysisABSTRACT
Fixed-removable implant prostheses provide solutions for some of the problems associated with implant dentistry, especially in the maxilla. The technique for using electrical discharge machining to create a precise passive fit between the substructure bar and the removable suprastructure is presented. The advantages, disadvantages, and complications associated with this type of prosthesis are discussed.
Subject(s)
Dental Casting Technique , Dental Implants , Dental Polishing/methods , Denture Design , Denture, Overlay , Denture Retention , Denture, Partial, Fixed , Denture, Partial, Removable , Electrolysis , HumansSubject(s)
Dental Implants , Orthodontic Appliances , Orthodontics, Corrective , Adult , Dental Abutments , Humans , MaleABSTRACT
Brånemark System implants were used for orthodontic anchorage to correct a cross-occlusion relationship between a mandibular canine and a maxillary lateral incisor.
Subject(s)
Dental Abutments , Dental Implants , Tooth Exfoliation/rehabilitation , Tooth Movement Techniques/instrumentation , Adult , Denture, Partial, Fixed , Denture, Partial, Removable , Humans , MaleABSTRACT
Denture sore mouth is most often caused by improperly fitting dentures. Ulcers, stomatitis, hyperplasia, bone resorption, and chronic candidiasis may develop under improperly fitting dentures. If extensive bone resorption occurs, dental implants may be necessary. Malignant changes can develop.
Subject(s)
Stomatitis, Denture , Stomatitis , Aged , Alveolar Process/pathology , Bone Resorption/etiology , Dentures , Gingival Hyperplasia/etiology , Humans , Hyperplasia/etiology , Middle Aged , Mouth Diseases/etiology , Mouth Mucosa/pathology , Palate/pathology , Ulcer/etiologyABSTRACT
As an alternative to conventional removable dentures, osseointegrated dental implants can now be used in carefully selected edentulous or partially edentulous patients. The implant consists of a dental prosthesis and an anchorage unit made up of screw-connected components. The implantation procedure is performed in two phases: fixture installation and fixture uncovering and abutment connection. After completion of these surgical procedures, the dental prosthesis is fabricated and inserted. Follow-up examinations are scheduled at 1, 3, and 6 months and then annually thereafter. During a 2-year period at the Mayo Clinic, 358 osseointegrated dental fixtures were implanted in 70 patients. The overall success rate in this consecutive series of patients was 98%, and the associated complications were minimal and easily resolved.
Subject(s)
Dental Implantation, Endosseous , Mouth, Edentulous/rehabilitation , Aged , Dental Implantation, Endosseous/methods , Denture, Complete, Lower , Female , Humans , Jaw Relation Record , Jaw, Edentulous, Partially/diagnosis , Jaw, Edentulous, Partially/rehabilitation , Male , Middle Aged , Mouth, Edentulous/diagnosis , Oral Surgical Procedures, Preprosthetic , Postoperative ComplicationsABSTRACT
A technique has been developed whereby collarless metal-ceramic crowns can be fabricated by spot-welding the platinum-foil matrix to the casting after it has been contoured for porcelain application. The main advantage of this procedure over previously reported techniques is that it produces well fitted restorations while requiring a lesser degree of technical skill.
